Out of sheer curiosity, I went to the Library and searched a cookbook that I had given to my sister and BIL during their first decade of marriage. I saw a five-star rating, and apparently thinking I was on Amazon, I clicked the 5 stars to see a review. That didn't happen - the page now says that the book has 2 5-star ratings instead of one.
I didn't mean to give it a rating! I don't know enough about it to give it a rating. I never looked inside it since I gave it to my sister.
I've never given ratings on my own cookbooks - my rule is never give a rating or review to a cookbook until you've cooked at least six recipes from it - more or fewer according to length.
How do I withdraw that accidental and meaningless rating?